it is still the worst single act of gun violence in u.s. history. an the only school shooting that involved more fatalities than today. for so many of us today was a reminder of one day on april 20, 1999, when the now infamous names kle became part f the american dialogue. we suffered great heartache as the two students opened fire and killed 12 other students about teacher and wounded 20 others before killing themselves at columbine high school. looking further back to history now, really the first time the nation dealt with this kind of violence on a campus. august 1, 1966, austin, texas. a university of texas student killed 16 people and wounded 32 others in and around campu campus. again today, now the second worst single day of violence at school. virginia tech massacre in 2007 remains atop that horrible list. jon, this is not unique to our nation. you will remember you and i were on there, reporting in july of 2011, in norway, that gunman who shot and killed at least 85 people at a youth camp there. back to you. >> jon: similar events in russi